Combined knob and dial



Nov. 4 1924.

W. J. MURDOCK COMBINED KNOB AND DIAL Filed July 29 i922 liwmrarwllzmcfillunlocfl. 7

Patented Nov, 4 1924,

' lTED' STAT-Ed WILLIAM J. MURDOCK, 0F CHELSEA, MASSACHUSETTS.

comma!) KNOB arm DIAL.

Application filed July 29, 1822. Seriafl No. 578,309.

To all whom it may concern:

Be it known that 1, WILLIAM J. MURDOCK, a citizen of the United States,residing at Chelsea, in the county of Suffolk and State ofMassachusetts, have invented new and useful Improvements in CombinedKnobs and Dials, of which the following is a specification.

The present invention is concerned with a combined article which is atthe same time a knob adapted to be applied to a shaft and by which theshaftmay berotated, and a dial for measuring with respect to a scale ofangular degrees or other graduations the amount of rotary movement thusgiven to the shaft. The purpose of the invention is to provide a deviceof this nature having improved means for detachably and adjustablysecuring it to the shaft on which it is applied. For a statement of theexact nature of the improvements in which the invention consists,attention is directed to the following specification containing adescription in detail of the preferred embodiment of the invention, andto the drawings.

referred to in such specification.v

In the drawings,-'

Figure 1 is a perspective view showing the improved device and its modeof use. 7

igure 2 is an axial section of the same.

Figure 3 is an elevation, detached from its surroundings, of the bushingwhich is a part of the combined knob and dial.

The combined knob and dial with which this invention is concerned isadapted to be applied in front of or over a panel, on the en of a shaftwhich rejects through such panel. Difierent con itions under which a nobof the same design is to be used require that the manner of itsattachment to the shaft be adjustable, since difl'erent thicknesses ofpanel or different lengths of shaft may cause the protruding shaft endon which the knob is to be applied to project more or less far from thepanel, while practical conditions require that the dial be place to theanel.

The comblned knob and dial which, for brevity, I will generally refer tosimply as a knob, consists of a head a with which is connected a skirtor flange b having a beveled surface 0 bearing graduation or scale marks0?, This knob is required to be applied to a shaft 0 which protrudes atone end from a panel Conveniently t e entire knob is molded as anintegral unit from a plastic composition, as vulcanite, and in order togive strength and wearing quality to that part which receives the shaftthere is embedded in the mass of the material, while plastic, a bushing9 having a groove h to receive the plastic material so as to prevent itswithdrawal, and a knurled or otherwise roughened surface 21 to preventthe knob from turning upon it.

The bushing is adapted to be slipped over the shaft end, and to secureit on the shaft there is provided a set-screw j which is threadedthrough the side of the bushing so as to bear against the shaft and hasa long shank passing through a groove or assage in the skirt b to anorifice 7c in the eveled knob toward which the protruding shaft pro'ectsThis is important because it atfor s the greatest possible range ofadjustment of the knob, allowing it to be attached to a shaft havingonly a minimum extent of protrusion from the panel. Another advantageresultingfrom this location, in comparisonwith a possible location ofthe screw in the head a, is that its presence does not cause anyprojection-or other breakin .of

continuity in the sides ofthe knob w ich have to be engaged bythetfingers of the operator, thus lncreasin the comfort of the operatorin handling t e knob.

Various modifications ma be made in the structure of the knob an dialcombined within the scope of the invention and of the protection which Iclaim. Thus, for instance, instead of making the combined article as anintegral structure, the different elements maybe separately made andconnected together, whereby the finished article is a unit structure, aswell as when they are integrall united together. In the case lastindicate the skirt or flange may be made of sheet metal, or other sheetmaterial, suitably formed to provide the peripheral surface which bearsthe indicating graduations, or of cast metal or other cast or moldedplastic material, and attached by suitable fastening means to the head.-However made, the skirt or flange provides an interior space back of itsouter surface in which the set-screw is contained and concealed, and anorifice in its peripheral face or surface through which the head of theset-screw is accessible for setting up or .l0osening.

"What I claim and desire to secure by Letters Patent is:

1. A combined knob and dial formed as a unit structure adapted to beapplied on a shaft, a bushing in saidstructure, and a setscrew threadedin said bushing and being accessible for adjustment through theperipheral face of said dial.

2. A- combined knob and dial comprising a knob proper and a flangeunited as a unit structure, said flange having a beveled or peripheralsurface provided with index marks, a bushin embedded coaxially in saidstructure, an a set-screw threaded into theside of said bushing andcontained within said flange, with its outer end accessible through thebeveled face of the flange.

In testimony whereof I have aflixed my signature.

WILLIAM J. MURDOCK.

